The BGS Lexicon of Named Rock Units — Result Details

Pumphouse Member

Computer Code: PMP Preferred Map Code: PMP
Status Code: Full
Age range: Burrellian Stage (OK) — Burrellian Stage (OK)
Lithological Description: Mudstone.
Definition of Lower Boundary: Where seen, the mudstone unit overlies the Doon Hill Conglomerate Member of the Balclatchie Formation.
Definition of Upper Boundary: The mudstone unit is overlain by the Burn Side Conglomerate Member of the Balclatchie Formation (where seen).
Thickness: Estimated at about 10m
Geographical Limits: The Girvan area of southwest Scotland.
Parent Unit: Balclatchie Formation (BCH)
Previous Name(s): Balclatchie Beds (-3823)
Balclatchie Mudstones [Obsolete Name And Code: Use BCH] (BBM)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Balclatchie Farm area. Williams, 1962. 
Reference(s):
Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. 
Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable